increment filename if file exists. using c#

try this code

private void button1_Click(object sender, EventArgs e)
       {
           string fileName = "C:\\Backup";
           int count = 0;
           Find :
           if (File.Exists(fileName))
           {
               fileName = fileName + "(" + count.ToString() + ").txt";
               count++;
               goto Find;
           }
           else
           {
               //Add your logic here
               File.Create(fileName);
           }
       }

Hello Dear
there is a method which determines if there is a file in a directory

System.IO.File.Exists("FilePath")

you can use it like this

if (System.IO.File.Exists("FilePath"))
{
}
else
{
}

You can take this approach. This would work well if all these files are created in order. If you are expecting any gaps, you can add additional logic. However, its safe to add a check if file exist before creating the file

string dirPath = @"C:\BackUp";
string fileName = "BackUp";
string[] files = Directory.GetFiles(dirPath);
int count = files.Count(file => { return file.Contains(fileName); });

string newFileName = (count == 0) ? "BackUp.bak" : String.Format("{0} ({1}).bak", fileName, count + 1);

In all the other solution disk IO depends on number of files already exists. In this case its just one.

First add some path with file name:

string filePath = "c:\somefile.txt";

than chack if alredy exists:

FileInfo fi = new FileInfo(filePath);
if (fi.Exists)
{
//add new name, and create file
}
else
{
using (StreamWriter streamWriter == new StreamWriter(filePath, true))
{
streamWriter.WriteLine(@"some text");
streamWriter.Flush();
streamWriter.Close();
}
}

Try Directory.EnumerateFiles()[^], which will give you a list of files that you can check against your own template in order to decide what name you should use for the next in sequence.